Bronze foil.



E. OESER. BRONZE FOIL. APPLICATION FILED MAY 1, 1911.

1,037,515, Patented Sept. 3,1912.

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' T10 all whom iii may concern earns-r enrich,

'i EEK??? @ESIER, till? EERLIN, 'GERMANY.

BlitOhlEE F4311 Be it known that .r, Ennsr facturer, a subject of the German "Emperor, and resident of N0.- 20 Culmstrasse, Berlin, Germany, have invented certain new and useful Improvements in Bronze Foils, of which the following is a specification.

Bronze foils as they are frequently used as a substitute for leaf gold, are generally made by either applying a coat of paint con sisting; of a paint powder and a cement to a smooth surface say a glass plate'and before such coat of paint has dried strewing bronze powder on the same,'or by applying a coat of varnish to the glass plate, strewing bronze powder on said coat of varnish and Green, manuag'ain covering the said bronzed coat with varnish after any excess of bronze powder has been removed. As a varnish for the lat ter method generally the socalled zapon varnish 0r collodium is used. The bronze foil obtained by theformer method, has the advantage, that it will not let the color of the object covered with it shine through; it has the disadvantage, of not being weatherproof and therefore being readily oxidized and losing its fine appearance. This is particula rly the case, when the foil is employed for covering wood, leather and other inaterials, which are frequently used in the open air and are therefore subiectto the influences of the atmosphere. Far better results are obtained with the foil made after the second named method, particularly if the layer of bronze is subsequently covered with a coat of varnish. This latter kind of foil has, however, the disadvantage, that the color of the article covered with it, will easily shine tl'irougli, so that the fiery gloss of the bronze foil im tiaired. If such a foil is to be appl ed to the respective article by pressure with a heated die, the foil after the/latter method, not having a colored backing, will not be serviceable, as the-coat of varnish consisting of oollodium' or zapon varnish will not sutlice to securely fix the foil to the article covered withit, Whereas the foil mac c after the former method and having a colored backing will better adhere if; the article being covered with it.

The object of the present invention is to combine the advantages of the kinds'of bronze foils hitherto known, and. avoid their disadvantages. 1

The present invention consists in that the lnonzeioil is made according to diagram Figlpecification of Letters Patent.

Application filed Ma 1, 1911.

the rough surface of Patented Sept. 3,1912. Serial no. 624,385.

ure 1 of three superimposed layers, namely, at the bottom a layer of coloring matter 4!, on this a layer of bronze Z) and on this a coat of varnish c, or accordingto the diagram Fig. 2 of four superimposed layers, namely a coat of resin d, a layer of coloring matter a, a layer of bronze Z), a coat of varnish c, or according to diagram Fig. 3 of a coatof resin (5, a coat of varnish 0 a layer of bronze Z), a .coat of varnish 0 In all instances the layer of coloring matter of resin is turned toward the-article to be covered, the coat of varnish toward the observer, The'layer of coloring matter consists of a binding medium soluble in water, alcohol or ether, such as glue, dextrin, bumen and the like, or shellac, mastic, an

the like, or collodium, and of a powdered colored material (paint) mixed with this binding medium, which for the purpose of affording a good covering property is preferably chosen of a'white or yellowish color. After the coloring matter mixed with the binding medium 'has'been ground so finely, that it becomes applicable asa paint, it is applied by means of a brush to a 'well' cleaned glass plate or the glass plate may be also dipped into the paint. 'W hen the coat of paint has dried so fdr, that it is still somewhat adhesive, the bronze, powder is strewn on it in known manner, the excess of bronze'is brushed off, and finally a coatof varnish is applied. This coat of varnish may consist of thin liquid collodium or of zapon or any other suitable material. The termzapon applies to a productin the ma"- hot which is composed of celluloid tailipgs and a' mifiture of ether, alcohol andamylacetate. ,The composition of the coat-of varnish hall, however be considered as immaterial to the principle of the invention.

If for the purpose of obtainingabetter adhesiv'eness of thd foil, :1 coat or layer of resin is employed beneath the layer of coloring matter or the bot om coat of varnish, this coat of I shellac dissolved in alcohol, to which solution, if so desirable, some mastic may be added. By all means a. layer of coloring matter or a coat of varnish must be interposed bet-ween this coat of resin and the layer of bronze as the resin which is fused on the foil being embossed. with a hot die to the article under treatment would penetrate the layer of bronze and impair the fiery gloss of the same. If

resin Wiil refer-ably consist of the bronze foil is backed with a coat of resin, the coloring matter may in some cases be dispensed with, as it is the case with the third form according to diagram Fig. 3

because the resin will ha \e a covering power of its own, particularly it mixed with some mastic and of a yellowish or orange color.

Then the bronze foil has been made in the hereinbeiore described manner b3. subsequent application of the several layers and coats and after all these have dried completely, the whole is detached by means of a spattle, a painters tool resembling a plane iron, from the glass plate. The thus detached bronze foil is spread the same as a piece of leaf gold between two sheets of paper and kept there until it is to be used.

The foil is used by laying it on the object to be covered and pressing it to the same by means of a suitably engraved and it necessary heated die. After pressing the parts of foil projecting beyond the embossed pattern are removed with a soft brush. If,

however, the foil is to be used for covering a wall a stone or a lar e' iece of metal a- 1 a binding material as a backing, a layer of bronze on said coloring matter, a resinous covering beneath the backing of the coloring matter and a coat of varnish onsaid bronze.

The foregoing specification signed at- Berlin, Germany, this nineteenth day of April, 1911.

ERNST OESER.

In presence of- HENRY Hzisrnn, Women/ran Ham. 

